From: Stephen Hemminger <shemminger@linux-foundation.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH] i386: optimize memset of 6 and 8 bytes
Date: Fri, 17 Aug 2007 18:54:52 -0700 [thread overview]
Message-ID: <20070817185452.5cbf60c4@freepuppy.rosehill.hemminger.net> (raw)
In-Reply-To: <1187401774.2789.0.camel@laptopd505.fenrus.org>
On Fri, 17 Aug 2007 18:49:34 -0700
Arjan van de Ven <arjan@infradead.org> wrote:
>
> On Fri, 2007-08-17 at 16:50 -0700, Stephen Hemminger wrote:
> > Tne network code does memset for 6 and 8 byte values, that can easily
> > be optimized into simple assignments without string instructions.
>
>
> so... question.
> Why are we doing this by hand? Wouldn't gcc just generate this code in
> the first place (when using __builtin_memset)? I very much suspect it
> would (and if some version doesn't.... we really ought to get that
> fixed)
i386 and x86_64 are not using __builtin_memset, as least from the
code that I see generated.
--
Stephen Hemminger <shemminger@linux-foundation.org>
next prev parent reply other threads:[~2007-08-18 1:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-17 23:50 [PATCH] i386: optimize memset of 6 and 8 bytes Stephen Hemminger
2007-08-18 1:49 ` Arjan van de Ven
2007-08-18 1:54 ` Stephen Hemminger [this message]
2007-08-18 1:57 ` Arjan van de Ven
2007-08-18 3:31 ` Stephen Hemminger
2007-08-18 4:53 ` David Miller
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